I am working with a Rem 700 LSS w/ 27" Broughton 5C bbl in 300 RUM. I use Federal Premium brass and Fed GM215M primers. All brass is resized using Redding S type bushing dies. I have the dies set up to push the shoulders back about .002". Reloaded ammo chambers easily. Here is the problem: Working with a variety of bullets 190gr - 210gr @ velocities of 2,900--3,000 ft/sec cause slight difficulty in extraction. Bolt lift is a little tight (often with an audible click) and rearward pull starts out tight. Moving up to a 220gr bullet @ 3,000 ft/sec will cause a stuck case that can be lightly tapped out with a cleaning rod. Cases show no signs of excess pressure, primers are normal. I tried Rem brass just as a test but had similar results. I have used H4831, RE25, H1000, Retumbo & H869, all with similar results. These are all well under a maximum load for the 300 RUM. For whatever it's worth, preferred loads are shooting in the .3's. What is causing the sticky cases?